Penn Foster Civil Drafting project plate 3 and 4

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sorsini
10

sorsini 10

Hello, I am working on the same civil drafting project from Penn Foster that I have read through some of these threads. I have completely finished plate 2 and my instructor informed me that everything was correct. For plates 3 and 4, I have already created my grids according to the instructions given.

I am having difficulties projecting my graph lines ( the existing and new elevations )

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sorsini
10

sorsini 10

Thanks for the response. Are they supposed to be projected or plotted on the grid? Meaning, After my grid is completed, I need to scale it up to match my plate 2 drawing, right? And then project the points like you indicated. What happens where the driveway starts to curve?

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sorsini
10

sorsini 10

The instructions do indicate "when plotting the drawing". I have my grid set up starting 0+00, 0+50, 1+00, and so on until 4+00. If I treat my centerline as a straight line, then I can definitely calculate and plot where everything is supposed to go ( start, curb, row, pc, pt and end) and I can calculate where the existing contours cross the centerline. I assume that existing contours will appear as a slop on my grid, and stationing will just be vertical lines on my grid with a label at the top?

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sorsini
10

sorsini 10

The original contours go from 180 down to 130. At the beginning and end of driveway is 180, then moving towards the center of the center of the driveway, each end goes down to 170, 160, and down to 130 near the middle of the driveway.

The new elevation is to be 180 with angle of repose 1.5:1

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ReMark
30

ReMark 30

In essence you have two centerline profiles. One for the existing contours and one for the new contours. Where the new profile is higher than the old profile that area will have to be filled in with soil. Where the new profile is lower than the old profile that area will have to have soil removed. Cut and fill. Got it? And don't forget the drainage pipe. It has to be shown as well. The invert of the pipe is somewhere around the 130 elevation I believe which is well below the grade of the new driveway.

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ReMark
30

ReMark 30

I assumed you were working on the centerline profile for the driveway. You're not; you're working on a cross-section. A slightly different animal.

The driveway doesn't reach elevation 185 at the turnaround?

BTW....your tree symbols would be fine if the trees were meant to be shown in elevation but they are being shown in a plan view. Not too many trees have that shape (like an arrow) unless a hurricane knocked them over.

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ReMark
30

ReMark 30

Maybe our terminology needs to be adjusted. The term "centerline" would be used to describe a line that runs down the length of a road or, in this case, a very long driveway. A section line is one that is arbitrarily placed to indicate where a section through a road or a driveway might be useful. Take an Exacto knife and cut off one of your fingers about midway from the tip. Turn you hand towards you so you can see the end of your finger where the tip used to be. See the muscle and the end of the bone? That would be a section.

In a few minutes I have to take a ride somewhere. I'll be out of touch for a while. However, if you have any further questions go right ahead and post them. I'll see what I can do to answer them later today if possible.

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sorsini
10

sorsini 10

I understand what a centerline and section is. Obviously I am not understanding what a profile is.

On my attached drawing, the left hand grid is for the centerline of the driveway. The left hand of the grid is the start (center of cul de sac) and going horizontally is stationing at every 50' (also indicated is the curb, pow, pc, pt and end of driveway) . Vertically is the elevation, starting at 110 going up to 190.

What I plotted on this grid is the culvert and the points where the elevation crosses the centerline in relationship to where it is lengthwise on the centerline. For example @ 180 elevation it crosses the centerline 75.94' away from the cul de sac and another 337.52 towards the end of the driveway.